Development of multianalyte sensor arrays for continuous monitoring of pollutants
- Tufts Univ., Medford, MA (United States). Max Tishler Lab. for Organic Chemistry
- Lawrence Livermore National Lab., CA (United States)
Industrial development has led to the release of numerous hazardous materials into the environment, posing a potential threat to surrounding waters. Environmental analysis of sites contaminated by several chemicals calls for continuous monitoring of multiple analytes. Monitoring can be achieved by using imaging bundles (300--400{micro}m in diameter), containing several thousand individual optical fibers for the fabrication of sensors. Multiple sensor sites are created at the distal end of the fiber by immobilizing different analyte specific fluorescent dyes. By coupling these imaging fibers to a charge coupled device (CCD), one has the ability to spatially and spectrally discriminate the multiple sensing sites simultaneously and hence monitor analyte concentrations. Prior to immobilization of the dye the distal end of the fiber is functionalized to permit covalent attachment of the polymer matrix. Discrete regions of the fiber bundle are successively illuminated through the proximal end so as to photo-polymerize the polymer matrix containing the fluorescent dyes. Current studies focus on the development of a multi-analyte sensor for monitoring Al{sup +3}, pH, hydrocarbons and uranyl ion. For the monitoring of Al{sup +3}, a variety of indicators are being evaluated for their applicability to sensor design. Lumogallion immobilized in poly HEMA shows considerable sensitivity and dynamic range. The fluorescent indicator eosin has been identified as the indicator for monitoring pH in the range 2.0--4.5. The indicator can be immobilized in an analogous fashion to fluoresce in{sup 3} (pH 4.5--8.0). Hydrocarbon sensors have been fabricated from different photo-polymers that show response to several hydrocarbons using Nile Red as the indicator.
- OSTI ID:
- 230961
- Report Number(s):
- CONF-950209-; TRN: IM9623%%271
- Resource Relation:
- Conference: 4. international symposium on field screening methods for hazardous wastes and toxic chemicals, Las Vegas, NV (United States), 22-24 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Field screening methods for hazardous wastes and toxic chemicals. VIP-47, Volume 1; PB: 733 p.
- Country of Publication:
- United States
- Language:
- English
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